"Footnote: Andy Murray is injured, Stan Wawrinka is on the comeback trail"

I am not sure Andy Murray can be described as "injured" he is supposedly "on the slow journey back after having an operation to fix his hip injury / hip condition". As yet he keeps declining invites to challenger tournaments saying he is not quite ready. The BBC say it is believed Murray has had "setbacks" but this could be just hot air on their part - as possible explanation as to why Murray has declined some of the invites on tournaments Murray had hoped to make. I just think Murray was overly optimistic on how long it would take to recover - but there seems to be very little information coming out of the Murray camp. (Ps I am sure even a fully fit / recuperated Murray would not be able to beat Nadal at RG).

As to "Can Anyone stop Rafa winning ... French Open" - the answer is no at the moment - only Rafa's body can beat him at the moment. He can also be beaten under very damp conditions - but the game will likely be suspended under those circumstances. When the ball gets wet Nadal loses the advantage of being able to spin the ball.

Out of the names mentioned I think only Thiem and Zverev would have any chance of beating Nadal. Zverev would need to get to the final to do so which considering his slam record to date would be a big step up for him. Thiem had a good year on clay in 2017 but appears to be a bit more inconsistent in 2018. I would have said Del Potro on his day but it looks like he might not even be fit enough to start this year.

As an aside the semi final last year between Wawrinka and Murray must have been pretty brutal as both picked up or worsened injuries which have more or less put them out of tennis for a year.